Seventeen has dropped a dance practice 'letter version' for "Pretty U"!

This practice seems to take you behind the scenes - literally - as they switch things around and run up to sing to the wall while you get to enjoy their antics from behind the sofa. How often do you get to see the performance from behind? They keep things fun, glancing back at you with wide smiles.

SEE ALSO: Seventeen rolls out gripping new teaser video for "MAESTRO" from their upcoming album '17 IS RIGHT HERE'